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Create and edit Excalidraw diagrams in your CanvasKeep workspace, with auto-layout and folders.
About
Create and edit Excalidraw diagrams in your CanvasKeep workspace, with auto-layout and folders.
Security Report
CanvasKeep MCP server authenticates with a bearer API key from environment variables, validates tool inputs as UUIDs, and performs AES-GCM encryption locally with the master key never sent to the server. Its network and env var access matches its stated purpose. The main concerns are that a configurable API URL could leak the API key if misconfigured, decrypted diagram content is passed into the AI context, and destructive tools like save_diagram_scene and delete_diagram can be triggered without confirmation. Supply chain analysis found 4 known vulnerabilities in dependencies (0 critical, 4 high severity). Package verification found 1 issue.
5 files analyzed · 10 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: CANVASKEEP_API_KEY
Environment variable: CANVASKEEP_MASTER_KEY
Environment variable: CANVASKEEP_API_URL
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-canvaskeep-canvaskeep-mcp": {
"env": {
"CANVASKEEP_API_KEY": "your-canvaskeep-api-key-here",
"CANVASKEEP_API_URL": "your-canvaskeep-api-url-here",
"CANVASKEEP_MASTER_KEY": "your-canvaskeep-master-key-here"
},
"args": [
"-y",
"canvaskeep-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
CanvasKeep MCP Server
An MCP (Model Context Protocol) server that lets AI tools like Claude Code and Codex generate Excalidraw diagrams and save them directly into your CanvasKeep workspace.
Setup
1. Get an API key
- Log in to CanvasKeep
- Click your profile menu (top right) and select API Keys
- Generate a new key and copy it immediately (you won't see it again)
2. Install and register
Claude Code:
claude mcp add canvaskeep \
-e CANVASKEEP_API_KEY=ck_your_key_here \
-- npx canvaskeep-mcp
Codex / other MCP clients:
{
"mcpServers": {
"canvaskeep": {
"command": "npx",
"args": ["canvaskeep-mcp"],
"env": {
"CANVASKEEP_API_KEY": "ck_your_key_here"
}
}
}
}
3. Environment variables
| Variable | Required | Default | Description |
|---|---|---|---|
CANVASKEEP_API_KEY | Yes | - | Your API key from the CanvasKeep dashboard |
CANVASKEEP_MASTER_KEY | No | - | Needed to read or edit encrypted diagrams. Copy it from canvaskeep.com/dashboard/encryption (Key for the MCP server) |
CANVASKEEP_API_URL | No | https://canvaskeep.com | API base URL (override for local dev) |
Available tools
| Tool | Description |
|---|---|
list_workspaces | List all your workspaces |
create_workspace | Create a new workspace |
list_folders | List folders in a workspace |
create_folder | Create a new folder, optionally nested |
list_diagrams | List diagrams in a workspace |
create_diagram | Create a diagram, optionally inside a folder |
update_diagram | Rename a diagram |
delete_diagram | Permanently delete a diagram |
get_diagram_summary | Get diagram metadata and element count |
get_diagram_scene | Read the full Excalidraw scene of a diagram |
save_diagram_scene | Write a full Excalidraw scene back to a diagram |
generate_diagram | Generate a diagram from nodes and edges with auto-layout |
Encryption
Diagrams you encrypt in CanvasKeep stay encrypted when an AI tool works with them. When get_diagram_scene or save_diagram_scene touches an encrypted diagram, this server decrypts and re-encrypts it locally (AES-GCM, see src/encryption.ts) using CANVASKEEP_MASTER_KEY. The master key never leaves your machine.
generate_diagram sends the nodes and edges you give it to CanvasKeep, which lays them out on the server, so diagrams generated this way are stored unencrypted.
Example usage
Ask Claude Code something like:
"Draw an architecture diagram of a web app with a React frontend, Node API, PostgreSQL database, and Redis cache"
Claude will use the MCP tools to create a diagram in your CanvasKeep workspace with properly laid-out boxes and labeled arrows.
Development
git clone https://github.com/CanvasKeep/canvaskeep-mcp.git
cd canvaskeep-mcp
npm install
npm run build
CANVASKEEP_API_KEY=ck_... CANVASKEEP_API_URL=http://localhost:3000 node dist/index.js
To run your local build from Claude Code:
claude mcp add canvaskeep \
-e CANVASKEEP_API_KEY=ck_your_key_here \
-- node /path/to/canvaskeep-mcp/dist/index.js
License
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